Hi upwards and forever and welcome to the forum
I think that the offer you are making is sensible, as everyone with a mortgage who is in an IVA is suffering from interest rate rises and struggling to maintain their contributions.
The key test of whether your offer is realistic will be to value the level of equity in your own property at this moment in time. Could you confirm the present value of your property and the amount you owe on your mortgage.
It is even more important for you to consider the merits of an early settlement now, given that you are faced with remortgaging again when your current discounted rate ends, and I imagine no provision was built into your IVA for this when it was presented to your creditors.
A good IP will present your current circumstances fairly to the creditors, and probably recommend the early settlement as being in every parties interests.
Do continue to post and let us know how you get on.
Regards, Melanie Giles, Insolvency Practitioner for over 20 years.
For further details contact me at
http://www.melaniegiles.com and view my IVA blog at:
http://melaniegiles.blogs.iva.co.uk